自定义带进度条的WebView

重写WebView,在其中通过addView()加入进度条,主要就是进度条样式和位置的设置。

1.水平进度条

public class ProgressWebView extends WebView {

	private ProgressBar progressbar;

	public ProgressWebView(Context context, AttributeSet attrs) {
		super(context, attrs);
		progressbar = new ProgressBar(context, null,
				android.R.attr.progressBarStyleHorizontal);
		progressbar.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT,
				5, 0, 0));
		addView(progressbar);
		setWebChromeClient(new WebChromeClient());
	}

	public class WebChromeClient extends android.webkit.WebChromeClient {
		@Override
		public void onProgressChanged(WebView view, int newProgress) {
			if (newProgress == 100) {
				progressbar.setVisibility(GONE);
			} else {
				if (progressbar.getVisibility() == GONE)
					progressbar.setVisibility(VISIBLE);
				progressbar.setProgress(newProgress);
			}
			super.onProgressChanged(view, newProgress);
		}

	}

	@Override
	protected void onScrollChanged(int l, int t, int oldl, int oldt) {
		LayoutParams lp = (LayoutParams) progressbar.getLayoutParams();
		lp.x = l;
		lp.y = t;
		progressbar.setLayoutParams(lp);
		super.onScrollChanged(l, t, oldl, oldt);
	}
}

2.圆形进度条，居中

public class ProgressWebView extends WebView {

	private ProgressBar progressbar;

	public ProgressWebView(Context context, AttributeSet attrs) {
		super(context, attrs);

		LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
				LinearLayout.LayoutParams.MATCH_PARENT,
				LinearLayout.LayoutParams.MATCH_PARENT);
		params.gravity = Gravity.CENTER;
		LinearLayout layout = new LinearLayout(context);
		layout.setLayoutParams(params);

		progressbar = new ProgressBar(context, null,
				android.R.attr.progressBarStyle);
		LinearLayout.LayoutParams params2 = new LinearLayout.LayoutParams(
				LinearLayout.LayoutParams.MATCH_PARENT,
				LinearLayout.LayoutParams.WRAP_CONTENT);
		params2.gravity = Gravity.CENTER;

		layout.addView(progressbar, params2);

		addView(layout);
		setWebChromeClient(new WebChromeClient());
	}

	public class WebChromeClient extends android.webkit.WebChromeClient {
		@Override
		public void onProgressChanged(WebView view, int newProgress) {
			if (newProgress == 100) {
				progressbar.setVisibility(GONE);
			} else {
				if (progressbar.getVisibility() == GONE)
					progressbar.setVisibility(VISIBLE);
				progressbar.setProgress(newProgress);
			}
			super.onProgressChanged(view, newProgress);
		}

	}

	@Override
	protected void onScrollChanged(int l, int t, int oldl, int oldt) {
		super.onScrollChanged(l, t, oldl, oldt);
	}
}